Statistics - quiz 3

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8

A researcher has collected the following sample data 5, 12, 6, 8, 5, 6, 7, 5, 12, 4 The 75th percentile is

7

A researcher has collected the following sample data 5, 12, 6, 8, 5, 6, 7, 5, 12, 4 The mean is

6

A researcher has collected the following sample data 5, 12, 6, 8, 5, 6, 7, 5, 12, 4 The median is

5

A researcher has collected the following sample data 5, 12, 6, 8, 5, 6, 7, 5, 12, 4 The mode is

2

A researcher has collected the following sample data. 3, 5, 12, 3, 2 The mean of the sample is 5. The interquartile range is

10

A researcher has collected the following sample data. 3, 5, 12, 3, 2 The mean of the sample is 5. The range is

4.062

A researcher has collected the following sample data. 3, 5, 12, 3, 2 The mean of the sample is 5. The standard deviation is

16.50

A researcher has collected the following sample data. 3, 5, 12, 3, 2 The mean of the sample is 5. The variance is

median

The value which has half of the observations above it and half the observations below it is called the

negative

The variance can never be

24

The variance of a sample of 169 observations equals 576. The standard deviation of the sample equals

8

The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals

can never be negative

The variance of the sample

22

A group of students had dinner at a local restaurant. The total bill for the dinner was $414.70. Each student paid his/her equal share of the bill, which was $18.85. How many students were at the dinner?

correlation coefficient

A numerical measure of linear association between two variables is the

covariance

A numerical measure of linear association between two variables is the

sample statistic

A numerical value used as a summary measure for a sample, such as sample mean, is known as a

12.5

Given the following information: Standard deviation = 8 Coefficient of variation = 64% The mean would then be

is the average value of the two middle items when all items are arranged in ascending order

If a data set has an even number of observations, the median

784

If the coefficient of variation is 40% and the mean is 70, then the variance is

positive relation between the independent and the dependent variables

Positive values of covariance indicate

median

The 50th percentile is the

third quartile

The 75th percentile is referred to as the

the standard deviation divided by the mean times 100

The coefficient of variation is

cannot be larger than 1

The correlation coefficient

-1 and +1

The correlation coefficient ranges between

range

The difference between the largest and the smallest data values is the

is the same as the 25th percentile

The first quartile

40%

The heights (in inches) of 25 individuals were recorded and the following statistics were calculated mean = 70 mode = 73 median = 74 range = 20 variance = 784 The coefficient of variation equals

30.00%

The hourly wages of a sample of 130 system analysts are given below. mean = 60 mode = 73 median = 74 range = 20 variance = 324 The coefficient of variation equals

the difference between the third quartile and the first quartile

The interquartile range is

the range

The measure of dispersion that is influenced most by extreme values is

central location

The median is a measure of

50th percentile

The median of a sample will always equal the

mode

The most frequently occurring value of a data set is called the

dividing the frequency of the class by the sample size

The relative frequency of a class is computed by

4096

The standard deviation of a sample of 100 observations equals 64. The variance of the sample equals

11.25%

The weights (in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated. mean = 160 mode = 165 median = 170 range = 60 variance = 324 The coefficient of variation equals

Positive

When the data are skewed to the right, the measure of Skewness will be

the trimmed mean

When the smallest and largest percentage of items are removed from a data set and the mean is computed, the mean of the remaining data is


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